The Demon Headmaster

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The Demon Headmaster is a series of books by Gillian Cross which were later adapted as a television series starring Terrence Hardiman in the title role and Frances Amey as Dinah.

The title character is a strange being with the powers of hypnosis and a desire to take over the world, as he believes it will be better under his ordered rule. He has piercing light green eyes, which he normally hides behind dark-tinted glasses —- removing these in order to hypnotise his victims.

Very little about the Demon Headmaster or his background is shown in the books. His name is never revealed; he is referred to only as 'the Headmaster' both in the books and on television, except when he takes on an alias —- such as the Computer Director in The Prime Minister's Brain, for example; and on each occasion he uses a title rather than a name. It's revealed in-narrative that he does have a name (Brain has characters forced to add the name to a list of people allowed to visit the Prime Minister, and Takes Over involves the Headmaster's name as a plot point), but the name itself is never spoken by anyone.